Did they say they asked? I thought that comment just indicated that they had noticed. And since you are the person who brought up the concept of identifying as a boy in this context, I don't think anyone else can tell you why it might have seemed relevant.
I am not sure exactly what gender identity rule I have broken for asking my original question but I find it pretty interesting whether those who identify as a girl also are girls biologically but identify as boys or whether they are biologically born boys.
The reasons I asked was because it was claimed that many of those who use it identify as boys.
Maybe I am alone in thinking this is an important distinction but none the less I find it pretty relevant to what to make out of it in the grander scheme of this discussion.